A nice image in that line. Which, since reading A Lover’s Discourse: Fragments by Roland Barthes, has made me think of Treppenwitz. Literally, ‘the wisdom of the stairs’. The striking reply that crosses one’s mind belatedly when already leaving, on the stairs.
Though, I’ve always preferred Cynthia Ozick’s version of the word: Treppenworte. The words one didn’t have the strength or ripeness to say when those words were necessary for one’s dignity or survival.